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0c632d36 | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
0c632d36 UH |
3 | * |
4 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
c2bf5506 | 6 | * Copyright (C) 2015 Daniel Elstner <daniel.kitta@gmail.com> |
0c632d36 | 7 | * |
c2bf5506 | 8 | * This program is free software: you can redistribute it and/or modify |
0c632d36 | 9 | * it under the terms of the GNU General Public License as published by |
c2bf5506 | 10 | * the Free Software Foundation, either version 3 of the License, or |
0c632d36 UH |
11 | * (at your option) any later version. |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
c2bf5506 | 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
0c632d36 UH |
20 | */ |
21 | ||
6ec6c43b | 22 | #include <config.h> |
0c632d36 | 23 | #include <stdlib.h> |
db156e54 | 24 | #include <memory.h> |
0c632d36 UH |
25 | #include <glib.h> |
26 | #include <libusb.h> | |
c1aae900 | 27 | #include <libsigrok/libsigrok.h> |
0c632d36 UH |
28 | #include "libsigrok-internal.h" |
29 | ||
1953564a | 30 | /* SR_CONF_CONN takes one of these: */ |
039a2fd7 | 31 | #define CONN_USB_VIDPID "^([0-9a-fA-F]{4})\\.([0-9a-fA-F]{4})$" |
0c632d36 UH |
32 | #define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$" |
33 | ||
3544f848 | 34 | #define LOG_PREFIX "usb" |
0c632d36 | 35 | |
c1adbb1e DE |
36 | #if !HAVE_LIBUSB_OS_HANDLE |
37 | typedef int libusb_os_handle; | |
38 | #endif | |
39 | ||
c2bf5506 | 40 | /** Custom GLib event source for libusb I/O. |
c2bf5506 DE |
41 | */ |
42 | struct usb_source { | |
43 | GSource base; | |
44 | ||
45 | int64_t timeout_us; | |
46 | int64_t due_us; | |
47 | ||
48 | /* Needed to keep track of installed sources */ | |
49 | struct sr_session *session; | |
50 | ||
51 | struct libusb_context *usb_ctx; | |
52 | GPtrArray *pollfds; | |
53 | }; | |
54 | ||
55 | /** USB event source prepare() method. | |
56 | */ | |
57 | static gboolean usb_source_prepare(GSource *source, int *timeout) | |
58 | { | |
59 | int64_t now_us, usb_due_us; | |
60 | struct usb_source *usource; | |
61 | struct timeval usb_timeout; | |
62 | int remaining_ms; | |
63 | int ret; | |
64 | ||
65 | usource = (struct usb_source *)source; | |
66 | ||
67 | ret = libusb_get_next_timeout(usource->usb_ctx, &usb_timeout); | |
68 | if (G_UNLIKELY(ret < 0)) { | |
69 | sr_err("Failed to get libusb timeout: %s", | |
70 | libusb_error_name(ret)); | |
71 | } | |
72 | now_us = g_source_get_time(source); | |
73 | ||
74 | if (usource->due_us == 0) { | |
75 | /* First-time initialization of the expiration time */ | |
76 | usource->due_us = now_us + usource->timeout_us; | |
77 | } | |
78 | if (ret == 1) { | |
79 | usb_due_us = (int64_t)usb_timeout.tv_sec * G_USEC_PER_SEC | |
80 | + usb_timeout.tv_usec + now_us; | |
81 | if (usb_due_us < usource->due_us) | |
82 | usource->due_us = usb_due_us; | |
83 | } | |
84 | if (usource->due_us != INT64_MAX) | |
85 | remaining_ms = (MAX(0, usource->due_us - now_us) + 999) / 1000; | |
86 | else | |
87 | remaining_ms = -1; | |
88 | ||
89 | *timeout = remaining_ms; | |
90 | ||
91 | return (remaining_ms == 0); | |
92 | } | |
93 | ||
94 | /** USB event source check() method. | |
95 | */ | |
96 | static gboolean usb_source_check(GSource *source) | |
97 | { | |
98 | struct usb_source *usource; | |
99 | GPollFD *pollfd; | |
100 | unsigned int revents; | |
101 | unsigned int i; | |
102 | ||
103 | usource = (struct usb_source *)source; | |
104 | revents = 0; | |
105 | ||
106 | for (i = 0; i < usource->pollfds->len; i++) { | |
107 | pollfd = g_ptr_array_index(usource->pollfds, i); | |
108 | revents |= pollfd->revents; | |
109 | } | |
110 | return (revents != 0 || (usource->due_us != INT64_MAX | |
111 | && usource->due_us <= g_source_get_time(source))); | |
112 | } | |
113 | ||
114 | /** USB event source dispatch() method. | |
115 | */ | |
116 | static gboolean usb_source_dispatch(GSource *source, | |
117 | GSourceFunc callback, void *user_data) | |
118 | { | |
119 | struct usb_source *usource; | |
120 | GPollFD *pollfd; | |
121 | unsigned int revents; | |
122 | unsigned int i; | |
123 | gboolean keep; | |
124 | ||
125 | usource = (struct usb_source *)source; | |
126 | revents = 0; | |
127 | /* | |
128 | * This is somewhat arbitrary, but drivers use revents to distinguish | |
129 | * actual I/O from timeouts. When we remove the user timeout from the | |
130 | * driver API, this will no longer be needed. | |
131 | */ | |
132 | for (i = 0; i < usource->pollfds->len; i++) { | |
133 | pollfd = g_ptr_array_index(usource->pollfds, i); | |
134 | revents |= pollfd->revents; | |
135 | } | |
c2bf5506 DE |
136 | |
137 | if (!callback) { | |
138 | sr_err("Callback not set, cannot dispatch event."); | |
139 | return G_SOURCE_REMOVE; | |
140 | } | |
6cfc6c5c | 141 | keep = (*SR_RECEIVE_DATA_CALLBACK(callback))(-1, revents, user_data); |
c2bf5506 DE |
142 | |
143 | if (G_LIKELY(keep) && G_LIKELY(!g_source_is_destroyed(source))) { | |
144 | if (usource->timeout_us >= 0) | |
145 | usource->due_us = g_source_get_time(source) | |
146 | + usource->timeout_us; | |
147 | else | |
148 | usource->due_us = INT64_MAX; | |
149 | } | |
150 | return keep; | |
151 | } | |
152 | ||
153 | /** USB event source finalize() method. | |
154 | */ | |
155 | static void usb_source_finalize(GSource *source) | |
156 | { | |
157 | struct usb_source *usource; | |
158 | ||
159 | usource = (struct usb_source *)source; | |
160 | ||
161 | sr_spew("%s", __func__); | |
162 | ||
163 | libusb_set_pollfd_notifiers(usource->usb_ctx, NULL, NULL, NULL); | |
164 | ||
165 | g_ptr_array_unref(usource->pollfds); | |
166 | usource->pollfds = NULL; | |
167 | ||
168 | sr_session_source_destroyed(usource->session, | |
169 | usource->usb_ctx, source); | |
170 | } | |
171 | ||
172 | /** Callback invoked when a new libusb FD should be added to the poll set. | |
173 | */ | |
174 | static LIBUSB_CALL void usb_pollfd_added(libusb_os_handle fd, | |
175 | short events, void *user_data) | |
176 | { | |
177 | struct usb_source *usource; | |
178 | GPollFD *pollfd; | |
179 | ||
180 | usource = user_data; | |
181 | ||
5eff221e DE |
182 | if (G_UNLIKELY(g_source_is_destroyed(&usource->base))) |
183 | return; | |
184 | ||
c2bf5506 | 185 | pollfd = g_slice_new(GPollFD); |
00f0016c | 186 | #ifdef _WIN32 |
c2bf5506 DE |
187 | events = G_IO_IN; |
188 | #endif | |
189 | pollfd->fd = (gintptr)fd; | |
190 | pollfd->events = events; | |
191 | pollfd->revents = 0; | |
192 | ||
193 | g_ptr_array_add(usource->pollfds, pollfd); | |
5eff221e | 194 | g_source_add_poll(&usource->base, pollfd); |
c2bf5506 DE |
195 | } |
196 | ||
197 | /** Callback invoked when a libusb FD should be removed from the poll set. | |
198 | */ | |
199 | static LIBUSB_CALL void usb_pollfd_removed(libusb_os_handle fd, void *user_data) | |
200 | { | |
201 | struct usb_source *usource; | |
202 | GPollFD *pollfd; | |
203 | unsigned int i; | |
204 | ||
205 | usource = user_data; | |
206 | ||
5eff221e DE |
207 | if (G_UNLIKELY(g_source_is_destroyed(&usource->base))) |
208 | return; | |
209 | ||
c2bf5506 DE |
210 | /* It's likely that the removed poll FD is at the end. |
211 | */ | |
212 | for (i = usource->pollfds->len; G_LIKELY(i > 0); i--) { | |
213 | pollfd = g_ptr_array_index(usource->pollfds, i - 1); | |
214 | ||
215 | if ((libusb_os_handle)pollfd->fd == fd) { | |
5eff221e | 216 | g_source_remove_poll(&usource->base, pollfd); |
c2bf5506 DE |
217 | g_ptr_array_remove_index_fast(usource->pollfds, i - 1); |
218 | return; | |
219 | } | |
220 | } | |
221 | sr_err("FD to be removed (%" G_GINTPTR_FORMAT | |
222 | ") not found in event source poll set.", (gintptr)fd); | |
223 | } | |
224 | ||
225 | /** Destroy notify callback for FDs maintained by the USB event source. | |
226 | */ | |
227 | static void usb_source_free_pollfd(void *data) | |
228 | { | |
229 | g_slice_free(GPollFD, data); | |
230 | } | |
231 | ||
232 | /** Create an event source for libusb I/O. | |
233 | * | |
234 | * TODO: The combination of the USB I/O source with a user timeout is | |
235 | * conceptually broken. The user timeout supplied here is completely | |
236 | * unrelated to I/O -- the actual I/O timeout is set when submitting | |
237 | * a USB transfer. | |
238 | * The sigrok drivers generally use the timeout to poll device state. | |
239 | * Usually, this polling can be sensibly done only when there is no | |
240 | * active USB transfer -- i.e. it's actually mutually exclusive with | |
241 | * waiting for transfer completion. | |
242 | * Thus, the user timeout should be removed from the USB event source | |
243 | * API at some point. Instead, drivers should install separate timer | |
244 | * event sources for their polling needs. | |
245 | * | |
246 | * @param session The session the event source belongs to. | |
247 | * @param usb_ctx The libusb context for which to handle events. | |
248 | * @param timeout_ms The timeout interval in ms, or -1 to wait indefinitely. | |
249 | * @return A new event source object, or NULL on failure. | |
250 | */ | |
251 | static GSource *usb_source_new(struct sr_session *session, | |
252 | struct libusb_context *usb_ctx, int timeout_ms) | |
253 | { | |
254 | static GSourceFuncs usb_source_funcs = { | |
255 | .prepare = &usb_source_prepare, | |
256 | .check = &usb_source_check, | |
257 | .dispatch = &usb_source_dispatch, | |
258 | .finalize = &usb_source_finalize | |
259 | }; | |
260 | GSource *source; | |
261 | struct usb_source *usource; | |
262 | const struct libusb_pollfd **upollfds, **upfd; | |
263 | ||
264 | upollfds = libusb_get_pollfds(usb_ctx); | |
265 | if (!upollfds) { | |
266 | sr_err("Failed to get libusb file descriptors."); | |
267 | return NULL; | |
268 | } | |
269 | source = g_source_new(&usb_source_funcs, sizeof(struct usb_source)); | |
270 | usource = (struct usb_source *)source; | |
271 | ||
272 | g_source_set_name(source, "usb"); | |
273 | ||
274 | if (timeout_ms >= 0) { | |
275 | usource->timeout_us = 1000 * (int64_t)timeout_ms; | |
276 | usource->due_us = 0; | |
277 | } else { | |
278 | usource->timeout_us = -1; | |
279 | usource->due_us = INT64_MAX; | |
280 | } | |
281 | usource->session = session; | |
282 | usource->usb_ctx = usb_ctx; | |
283 | usource->pollfds = g_ptr_array_new_full(8, &usb_source_free_pollfd); | |
284 | ||
285 | for (upfd = upollfds; *upfd != NULL; upfd++) | |
286 | usb_pollfd_added((*upfd)->fd, (*upfd)->events, usource); | |
287 | ||
288 | #if (LIBUSB_API_VERSION >= 0x01000104) | |
289 | libusb_free_pollfds(upollfds); | |
290 | #else | |
291 | free(upollfds); | |
292 | #endif | |
293 | libusb_set_pollfd_notifiers(usb_ctx, | |
294 | &usb_pollfd_added, &usb_pollfd_removed, usource); | |
295 | ||
296 | return source; | |
297 | } | |
298 | ||
7ae6a758 BV |
299 | /** |
300 | * Find USB devices according to a connection string. | |
301 | * | |
302 | * @param usb_ctx libusb context to use while scanning. | |
303 | * @param conn Connection string specifying the device(s) to match. This | |
304 | * can be of the form "<bus>.<address>", or "<vendorid>.<productid>". | |
305 | * | |
306 | * @return A GSList of struct sr_usb_dev_inst, with bus and address fields | |
307 | * matching the device that matched the connection string. The GSList and | |
308 | * its contents must be freed by the caller. | |
309 | */ | |
310 | SR_PRIV GSList *sr_usb_find(libusb_context *usb_ctx, const char *conn) | |
0c632d36 | 311 | { |
7ae6a758 | 312 | struct sr_usb_dev_inst *usb; |
0c632d36 UH |
313 | struct libusb_device **devlist; |
314 | struct libusb_device_descriptor des; | |
315 | GSList *devices; | |
316 | GRegex *reg; | |
317 | GMatchInfo *match; | |
318 | int vid, pid, bus, addr, b, a, ret, i; | |
319 | char *mstr; | |
320 | ||
321 | vid = pid = bus = addr = 0; | |
322 | reg = g_regex_new(CONN_USB_VIDPID, 0, 0, NULL); | |
323 | if (g_regex_match(reg, conn, 0, &match)) { | |
e7f378fd | 324 | if ((mstr = g_match_info_fetch(match, 1))) |
0c632d36 | 325 | vid = strtoul(mstr, NULL, 16); |
0c632d36 UH |
326 | g_free(mstr); |
327 | ||
e7f378fd | 328 | if ((mstr = g_match_info_fetch(match, 2))) |
0c632d36 | 329 | pid = strtoul(mstr, NULL, 16); |
0c632d36 | 330 | g_free(mstr); |
91057d2f | 331 | /* Trying to find USB device via VID:PID. */ |
0c632d36 UH |
332 | } else { |
333 | g_match_info_unref(match); | |
334 | g_regex_unref(reg); | |
335 | reg = g_regex_new(CONN_USB_BUSADDR, 0, 0, NULL); | |
336 | if (g_regex_match(reg, conn, 0, &match)) { | |
e7f378fd | 337 | if ((mstr = g_match_info_fetch(match, 1))) |
1eb0a0df | 338 | bus = strtoul(mstr, NULL, 10); |
0c632d36 UH |
339 | g_free(mstr); |
340 | ||
e7f378fd | 341 | if ((mstr = g_match_info_fetch(match, 2))) |
1eb0a0df | 342 | addr = strtoul(mstr, NULL, 10); |
0c632d36 | 343 | g_free(mstr); |
91057d2f | 344 | /* Trying to find USB device via bus.address. */ |
0c632d36 UH |
345 | } |
346 | } | |
347 | g_match_info_unref(match); | |
348 | g_regex_unref(reg); | |
349 | ||
350 | if (vid + pid + bus + addr == 0) { | |
e7f378fd | 351 | sr_err("Neither VID:PID nor bus.address was specified."); |
0c632d36 UH |
352 | return NULL; |
353 | } | |
354 | ||
e4ce146f | 355 | if (bus > 255) { |
0c632d36 UH |
356 | sr_err("Invalid bus specified: %d.", bus); |
357 | return NULL; | |
358 | } | |
359 | ||
360 | if (addr > 127) { | |
361 | sr_err("Invalid address specified: %d.", addr); | |
362 | return NULL; | |
363 | } | |
364 | ||
365 | /* Looks like a valid USB device specification, but is it connected? */ | |
366 | devices = NULL; | |
367 | libusb_get_device_list(usb_ctx, &devlist); | |
368 | for (i = 0; devlist[i]; i++) { | |
369 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
d4928d71 PS |
370 | sr_err("Failed to get device descriptor: %s.", |
371 | libusb_error_name(ret)); | |
0c632d36 UH |
372 | continue; |
373 | } | |
374 | ||
7ae6a758 | 375 | if (vid + pid && (des.idVendor != vid || des.idProduct != pid)) |
0c632d36 | 376 | continue; |
0c632d36 | 377 | |
7ae6a758 BV |
378 | b = libusb_get_bus_number(devlist[i]); |
379 | a = libusb_get_device_address(devlist[i]); | |
380 | if (bus + addr && (b != bus || a != addr)) | |
0c632d36 | 381 | continue; |
0c632d36 UH |
382 | |
383 | sr_dbg("Found USB device (VID:PID = %04x:%04x, bus.address = " | |
384 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
385 | ||
6f63b1ee | 386 | usb = sr_usb_dev_inst_new(b, a, NULL); |
7ae6a758 | 387 | devices = g_slist_append(devices, usb); |
0c632d36 UH |
388 | } |
389 | libusb_free_device_list(devlist, 1); | |
390 | ||
91057d2f | 391 | /* No log message for #devices found (caller will log that). */ |
176d785d | 392 | |
0c632d36 UH |
393 | return devices; |
394 | } | |
395 | ||
396 | SR_PRIV int sr_usb_open(libusb_context *usb_ctx, struct sr_usb_dev_inst *usb) | |
397 | { | |
398 | struct libusb_device **devlist; | |
399 | struct libusb_device_descriptor des; | |
400 | int ret, r, cnt, i, a, b; | |
401 | ||
c5f1a021 | 402 | sr_dbg("Trying to open USB device %d.%d.", usb->bus, usb->address); |
0c632d36 UH |
403 | |
404 | if ((cnt = libusb_get_device_list(usb_ctx, &devlist)) < 0) { | |
405 | sr_err("Failed to retrieve device list: %s.", | |
406 | libusb_error_name(cnt)); | |
407 | return SR_ERR; | |
408 | } | |
409 | ||
410 | ret = SR_ERR; | |
411 | for (i = 0; i < cnt; i++) { | |
412 | if ((r = libusb_get_device_descriptor(devlist[i], &des)) < 0) { | |
413 | sr_err("Failed to get device descriptor: %s.", | |
414 | libusb_error_name(r)); | |
415 | continue; | |
416 | } | |
417 | ||
418 | b = libusb_get_bus_number(devlist[i]); | |
419 | a = libusb_get_device_address(devlist[i]); | |
c5f1a021 | 420 | if (b != usb->bus || a != usb->address) |
0c632d36 | 421 | continue; |
0c632d36 UH |
422 | |
423 | if ((r = libusb_open(devlist[i], &usb->devhdl)) < 0) { | |
424 | sr_err("Failed to open device: %s.", | |
425 | libusb_error_name(r)); | |
426 | break; | |
427 | } | |
428 | ||
429 | sr_dbg("Opened USB device (VID:PID = %04x:%04x, bus.address = " | |
430 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
431 | ||
432 | ret = SR_OK; | |
433 | break; | |
434 | } | |
435 | ||
436 | libusb_free_device_list(devlist, 1); | |
437 | ||
438 | return ret; | |
439 | } | |
6c60facc | 440 | |
67e95ed3 BV |
441 | SR_PRIV void sr_usb_close(struct sr_usb_dev_inst *usb) |
442 | { | |
443 | libusb_close(usb->devhdl); | |
444 | usb->devhdl = NULL; | |
445 | sr_dbg("Closed USB device %d.%d.", usb->bus, usb->address); | |
446 | } | |
447 | ||
102f1239 BV |
448 | SR_PRIV int usb_source_add(struct sr_session *session, struct sr_context *ctx, |
449 | int timeout, sr_receive_data_callback cb, void *cb_data) | |
6c60facc | 450 | { |
c2bf5506 | 451 | GSource *source; |
92248e78 DE |
452 | int ret; |
453 | ||
c2bf5506 DE |
454 | source = usb_source_new(session, ctx->libusb_ctx, timeout); |
455 | if (!source) | |
92248e78 | 456 | return SR_ERR; |
534b634c | 457 | |
6cfc6c5c | 458 | g_source_set_callback(source, G_SOURCE_FUNC(cb), cb_data, NULL); |
534b634c | 459 | |
c2bf5506 DE |
460 | ret = sr_session_source_add_internal(session, ctx->libusb_ctx, source); |
461 | g_source_unref(source); | |
4b9e2532 | 462 | |
c2bf5506 | 463 | return ret; |
6c60facc ML |
464 | } |
465 | ||
102f1239 | 466 | SR_PRIV int usb_source_remove(struct sr_session *session, struct sr_context *ctx) |
6c60facc | 467 | { |
c2bf5506 | 468 | return sr_session_source_remove_internal(session, ctx->libusb_ctx); |
6c60facc | 469 | } |
db156e54 | 470 | |
76bc5f63 | 471 | SR_PRIV int usb_get_port_path(libusb_device *dev, char *path, int path_len) |
db156e54 | 472 | { |
76bc5f63 AJ |
473 | uint8_t port_numbers[8]; |
474 | int i, n, len; | |
475 | ||
19643b96 UJ |
476 | /* |
477 | * FreeBSD requires that devices prior to calling libusb_get_port_numbers() | |
478 | * have been opened with libusb_open(). | |
b98b7022 | 479 | * This apparently also applies to some Mac OS X versions. |
19643b96 | 480 | */ |
b98b7022 | 481 | #if defined(__FreeBSD__) || defined(__APPLE__) |
19643b96 UJ |
482 | struct libusb_device_handle *devh; |
483 | if (libusb_open(dev, &devh) != 0) | |
484 | return SR_ERR; | |
485 | #endif | |
76bc5f63 | 486 | n = libusb_get_port_numbers(dev, port_numbers, sizeof(port_numbers)); |
b98b7022 | 487 | #if defined(__FreeBSD__) || defined(__APPLE__) |
19643b96 UJ |
488 | libusb_close(devh); |
489 | #endif | |
76bc5f63 | 490 | |
b98b7022 UH |
491 | /* Workaround FreeBSD / Mac OS X libusb_get_port_numbers() returning 0. */ |
492 | #if defined(__FreeBSD__) || defined(__APPLE__) | |
19643b96 UJ |
493 | if (n == 0) { |
494 | port_numbers[0] = libusb_get_device_address(dev); | |
495 | n = 1; | |
496 | } | |
497 | #endif | |
2f004b4b VP |
498 | if (n < 1) |
499 | return SR_ERR; | |
500 | ||
76bc5f63 AJ |
501 | len = snprintf(path, path_len, "usb/%d-%d", |
502 | libusb_get_bus_number(dev), port_numbers[0]); | |
db156e54 | 503 | |
76bc5f63 AJ |
504 | for (i = 1; i < n; i++) |
505 | len += snprintf(path+len, path_len-len, ".%d", port_numbers[i]); | |
db156e54 SA |
506 | |
507 | return SR_OK; | |
508 | } | |
69f7d9b4 JH |
509 | |
510 | /** | |
07182332 | 511 | * Check the USB configuration to determine if this device has a given |
69f7d9b4 JH |
512 | * manufacturer and product string. |
513 | * | |
514 | * @return TRUE if the device's configuration profile strings | |
515 | * configuration, FALSE otherwise. | |
516 | */ | |
517 | SR_PRIV gboolean usb_match_manuf_prod(libusb_device *dev, | |
518 | const char *manufacturer, const char *product) | |
519 | { | |
520 | struct libusb_device_descriptor des; | |
521 | struct libusb_device_handle *hdl; | |
522 | gboolean ret; | |
523 | unsigned char strdesc[64]; | |
524 | ||
525 | hdl = NULL; | |
526 | ret = FALSE; | |
527 | while (!ret) { | |
528 | /* Assume the FW has not been loaded, unless proven wrong. */ | |
529 | libusb_get_device_descriptor(dev, &des); | |
530 | ||
531 | if (libusb_open(dev, &hdl) != 0) | |
532 | break; | |
533 | ||
534 | if (libusb_get_string_descriptor_ascii(hdl, | |
535 | des.iManufacturer, strdesc, sizeof(strdesc)) < 0) | |
536 | break; | |
537 | if (strcmp((const char *)strdesc, manufacturer)) | |
538 | break; | |
539 | ||
540 | if (libusb_get_string_descriptor_ascii(hdl, | |
541 | des.iProduct, strdesc, sizeof(strdesc)) < 0) | |
542 | break; | |
543 | if (strcmp((const char *)strdesc, product)) | |
544 | break; | |
545 | ||
546 | ret = TRUE; | |
547 | } | |
548 | if (hdl) | |
549 | libusb_close(hdl); | |
550 | ||
551 | return ret; | |
552 | } |